EZsizer Ring Size Reducer, Ring Guard, Ring Size Adjuster. Size: Medium, for rings 2.5 mm to 3.5 mm wide. Medium 3 Pack  for rings (2.5-4.5mm wide) Reduces ring size up to 2 sizes. Easy to use (no tools needed for this ring size reducer) Can easily be cut shorter for less size reduction. Comfortable do to curved shape and hypoallergenic (medical grade vinyl) Kind to your ring! (does not scratch gold or silver). Costs far less than a full ring sizing